AN5637 Ver la hoja de datos (PDF) - Panasonic Corporation
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AN5637 Datasheet PDF : 11 Pages
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ICs for TV
s Electrical Characteristics at VCC = 9 V, Ta = 25 °C (continued)
• Explanations of testing method
1. Measurement of B−Y discrimination signal amplitude
2.
Pin15
AN5637
Pin9
∆VR
Pin10
∆VB
Input 100 % white signal and adjust the voltage of Pin4 so that ∆VB becomes 0 mV. Let the adjusted voltage be
VAD4.
And let the value of ∆VR based on input frequency at that time be fBER , black level error (R−Y).
3. Calculate by using the value of Pin10 (B−Y) output amplitude VBY when the color bar signal (Deviation = 460
kHz) is input to Pin16 and the value of Pin10 output VNOISE when the color bar signal (Deviation = 0 Hz) is input.
S/N = 20 log10VBY/VNOISE
4. The horizontal and vertical blanking level VBL is determined by the internal stabilizing power supply circuit.
5. The burst gate level VBG is determined by dividing the IC built-in resistor between VCC-GND.
VBG = VCC × 3.8/9 (typ.)
7
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